The cryagenic radiometer traceability method of the 1.3 μm/1.5 μm fiber laser power is reported. The traditional method to trace to the absolute radiometer is analyzed. The trap detector is calibrated against the cryogenic radiometer at wavelength of 633 nm, and use to deliver quantity value to trap quantity detector, and than the InGaAs detector is calibrated by the pyroelectric radiometer with power-stablized laser source at wavelengths of 1310 nm and 1550 nm and used to measure fiber laser power. The measurement result shows that with this traceability method, the standard deviations of the optical power correction coefficients at wavelengths of 1310 nm and 1550 nm are 0.0011 and 0.0007, respectively, and the uncertainty of measurement is better than 0.6％ (k=2). This method can keep the consistence of quantity value decline measurement uncertainty and increase accuracy of quantity value delivery.